Illuminating device for projecting purposes



S. E. DUANE, R. P. BUBROWS AND A. F. SINCLAIR.

ILLUMINATING DEVICE FOR PROJECTING PURPOSES.

APPLICAHON FILED JAN. 21.!915.

Patented Sept. 9, 1919.

3 SHEET SHEET I.

S. E. DUANE, R. P, BURROWS AND A. F. SINCLAIR. LLLUMINATING DEVICE ron PROJECTING PURPOSES.

APPLICAHON FILED L21. IQIG.

'1 ,3 1 5, 82 1 Patented Sept. 9, 1919.

5'2 3 SHEETSSHEET?. Pg. 5.

fzsr zzsrrans:

SAMUEL E. Deans,

Ans-H Jan 2''. Suarazaza,

T8218 .A'rranzvrar.

S- E. DUANE, R. P. BURROWS AND A. F. SINCLAIR.

ILLUMINATING DEVICE FOR PROJECTINQPURPOSES.

APPLICATION FILED JAN. 21. IBIS.

Patented Sept. 9, 1919.

3 SHEEN-SHEET 3 Jar 31.2mm ans Samcrrz .EZDaAarz', Razz-a? i=2 .Bvaaaw has: A22: 2-. Shara-yarn. 1y i Turn: Ara-pants:

UNITED STATES PATENT OFFICE.

SAMUEL EVERETT DOAN E, ROBERT 1. BUBBOWS, AND AROHIBALD F. SINCLAIR, OI

CLEVELAND, OHIO, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORA- T1011 01 NEW YORK.

Speciflcationof Letters Patent.

Patented Sept. 9, 1919.

' Application filed January 21,1916. Serial No. 73,442.

To all whom it may) concern:

Be it known that we, SAMUEL E. DUANE, ROBERT P. Bnnuows, and ABCHIBALD F. SIN- ('LAIR, citizens of the United States, residin at Cleveland, Cuyahoga county, State 0? Ohio, have invented certain new and useful Improvements in Illuminating Devices for Projecting Purposes, of which the following is a specification.

Our invention relates to illuminating de- Vices constituting parts of picture projection apparatus, and more particularly to housings including the supports for the light projecting elements, such as the light source, reflector and condenser which are ordinarily included in such devices. In the specification we have used the expression lamp housing to indicate the apparatus comprised by our invention. Our lamp housing is particularly ada ted tothe use of an electric incandescent amp as the light source. The

object of our invention is to provide a device of this character which will permit of the quick replacement of lamps when necessary, and which will also permit a ready and accurate adjustment of the light projecting elewithin the lamp housing supports for a plurality of incandescent lamps and means whereby one lamp may be rea ily substituted for another in operative relation to the rest .of the picture projecting apparatus. In its preferred form our invention comprises a lamp housing having at each end thereof an incandescent lam and means for concen trating and directing the light therefrom. The parts at both ends of the lamp housing are preferably symmetrically disposed with reference to an axis passing through the center of the lamp housin and the lamp housing is so mounted that 1t may be rotated upon this axis to bring the parts contained at either end thereof into accurately spaced relation with the other elements of the projection apparatus. Although it is ordinarily sufiiciently efiective to. have the lamp housing shifted manually to secure the desired substitution of lamps, our invention also includes the use of an automatic means for shifting the lamp housing upon the failure of the lamp in immediate use. As applied.

for automatically rotating the housing upon the failure of the lamp which is in immediate use and means for automatically stopping the said rotation when another lamp has been properly substituted for the lamp which has failed. Various other features and advantages of our invention will appear from the detailed description of a species and modifications thereof which follows and from a reference to the accompanying drawing.

In the drawing, Figure 1 is a diagrammatic view showing in proper assembled relation the parts of a moving picture projecting apparatus. Fig. 2 is a partiaLhorizontal section of the lamp housing showing a top plan of the lower platform and attachments forming part thereof. Fig. 3 is a trans verse vertical section through the housing. Fig. 4 is a partial vertical section on the -line 44 of. Fig. 2. Fig. 5 is a longitudinal housing showing the top plan of the upper platform and attachments. Fig. 7 is a vertical section through the mechanism for automatically rotating and stop ing the lamp housing. Fig? 8 is an end e evation of the same parts. ig. 9 is a diagram of the electric circuits, comprised in the apparatus.

As shown in Fig. 1, the moving picture apparatus com rises the lamp housmg 10 containing the i laminating portion of the apparatus with which our invention is concerned. The light projected from the said lamp housing is directed. through the film 11, which travels from the upper reel 12 and thelower reel 13 through the idlers 14 and the aperture plate 15. After passing through, the

candescent lamp 17 the reflector 18 and the.

condenser 19. The specific construction of these elements and their relative arrangement is disclosed in the application of John B. Taylor, Serial No. 35,768, filed June 23, 1915, which is assigned to the same assignee as is the present invention. The incandescent lamp 17 comprises the coiled filament 20, which, as shown in Fig. 3 has two parallel branches 21 lying in the same vertical 'atri plane. As disclosed in the Taylor application above referred to, the filament 20 is so disposed with relation to a horizontal axis passing through the center of the spherical reflector 18 and the condenser 19 that a real image of the said filament is reflected back to occu y a position in the same plane as the sai filament but slightly offset so that the ima e of a branch of the coiled filament will be fiocated between the branches 21 of the filament, and thus a racticallycontinuous area of light source is produced.

The lamp 17 and its socket 22 are earned by a vertically disposed stud 23, which is exteriorly threaded, and the lower end of which extends within and engages with an interior thread on a bushing 24 supported by and extending within the gearx 25, said interior thread bein shown in dotted lines in Fig. 2 as 26. he portion of the bushing 24 which is within the gear-box 25 has rigid attached thereto and circumfen entially t ereof a inion 27. This is engaged ,by a vertica ly disposed pinion 28, which is mounted upon the horizontally extending rotatable rod 29, which is supported by the gear-box 25, and'extends transversely of the housing through a slot 30 therein. The said rod carries at the other end thereof a knob 31. By turning the knob 31 the vertical position of the lamp 17 and of its filament 20 may be accurately adjusted. The gear-box 25, which carries the aforesaid parts is mounted in a transversely extendmg slot 32 in a table 33. The latter is grooved on both sides at 84 and sl-idabvly engages the extensions of a lower latform 35 sup rted near the bottom of tie housing. rotatable rod 36 carries at one end a pinion 3-7 which engages a stationery rack 38 on an extension of the platform 35. The said rod is sup orted in bearings 39 on the table 33' extends throu h a slot 40 in the side of the housin and as attire outer end thereof a knob 40 It will be apparent that by rotatin' the knob 40 the (ingitudmal 'osition o the lamp and its filament may accurately adjttglied. The sides 41; of the ar-bo'x 25 are perforated toengage with a t read 42 at one end of the horizontally (118* used rotatable rod 43 mounted in Marin 24 on the table 38. The other end of t said rod extends throu hza slot 43 and carries a knob 45.- It wi l be apparent that by properly turnin the said kn the trans verse position of t e lamp and its filament may be accurately ad1usted. The platform 85 is secured to the casing 10, as at 46; The housing as a whole is rotatably mount ed upon a centrally. disposed vertical shaft 47, which is stationary, being attached to table (not shownT)hor similar support y a fasteninf 48. e housi tached to a collar 9 loosely moon to sa' ihaft and supported by stationary bearits adjustment.

is at on the ing 50. The shaft 47 extends up through the casin 10 and there is preferably provided at t e top thereof a means for rotating the housing, especially when automatic meansare employed for bringing such rotating means into action upon the failure of a lamp as hereinbefore described. This rotating comprises a spiral spring 51, one end of which is secured to the stationary shaft 47 at 52, and the other end to a cover plate 53 loosely mounted on said shaft. The lower edge of the member 53 is serrated, the. teeth thereof engaging teeth on ratchet 54 fast to the housing. It will be apparent that the spring 51 may be wound up by turning the member 53 and that upon the release of a stop which normally holds the housing in position the said housing will be rotated.

he stop used in the form equip ed with the automatic attachment hereinbe ore referred to is shown in Figs. 3, 7 and 8 and com rise slidable pin 55 and spring pressed sli able grips 55'.

The platform 35, as shown particularly in Figs. 2 and 4, carries at the middle portion thereof and on each side pairs of U-shaped contacts 56 and 57 suitably separated therefrom by insulations 58 and 59 respectively. The central shaft 47 has a collar 60 rigidly attached thereto which supports pairs of stationary knife-blade contacts 61 and 62, insulations 63 separatin the same from the said collar. The air 0 contacts 56 and 57 are each connec to a socket for one of the incandescent lamps by suitable leads (not shown). Each pair of the stationary contacts 61 and 62 is connected to the energy supply means, the connections not bei g shown. The electrical circuits will be escribed her'einafter Supported by the sides of the casing 10 and near the top thereof is a platform 64 which serves to saport the reflector :18 and c said platform is similar in shape to the platform 35 and is provided at each end with extensions receivin the table 65, the sides of which are groove at 66, and which slidably engage with the platform extension at that end. The table 65 is transversely slotted at 67. A holder 68 is slidably supgorted by the table in the,

saidslot, the em holder being vertically recessed torecei e the'extension rod 69 attached to the reflector 18. A set screw 70 engages with the said rod, thus allowing the OSitlOl'l of the reflector to be vertically ad- ;ust'ed. The portion of the holder 68 extendmg above the table 65 has a rearwardly extending flange 71 through which passes the,

threaded end of a set screw 72 rotatably supported in bearings 73 upon the said table,

and extending thro h a slot 74 in the side of the casing It w be apparent that by suitably turning the set screw the reflector may be transversely adjusted, A rack 75 a the app mounted on the platform 64 extends adjacent to the table 65 and is engaged b a pinion 76 at the end of a'rotatab e re 77 supported in bearing 78 on the said table. The said rod extends through a slot 79. It will be apparent that by properl turning the said rod the reflector may be longitudinall adjusted.

T e electric sup 1y circuits for the lamps 17 at each end of t e housing are shown diagrammatically in Fig. 9. A transformer 80 supplies current at a comparatively high vo talge through the leads 81 to the leads 82, whic are connected to the stationary contacts 61 with which the movable contacts 56 connected to that lam 17 which is in immediate use engage. T e transformer 80 also furnishes current at a comparativel low voltage through leads 83 to the stationary contacts 62 with which the movable contacts 57 connected to that lamp 17 which is not in use en age. It is apparent that this portion of t e supply circuit may be omitted. However, it is desirable that means be rolvided for lighting up that lamp 17 w ich is not in immediate use so that it may be properly adjusted to be ready for such use when called u n. It is not necessary that the lamp be il uminated to its fullest extent for this purpose, and therefore, the voltage of the current supplied is preferably low. However, this is not imperative. A double contact switch 84 may be rovided for cutting off thecurrent when esired.

It will be apparent that thatportion of aratus shown which is described above is sufiicient for practical operation with or without the spring rotating device or the stop mechanism In such case whenever a lamp fails or it is desired to substitute another lamp for any rtason, the housing may be readi rotated manuall to bring the other lamp into operative re ation"'with the rest of the picture rejecting apparatus. However, in the orm shown an automatic means is provided for efiecting the operation upon the failure of the lamp. For this purpose there is included in series with the lamp in immediate use the windin of the solenoid 85. The winding of anot er solenoid 86 is connected in shunt with the supply circuit for this lamp 17. The in 55 constitutes an armature controlled liy the solenoid 86. The

winding of the said solenoid is connected to the metal casing 87 of a dashpot having therein a piston 88 from which extends a contact 89 normally resting upon the contact 90, which is apertured in linewith the core of the solenoid 86 and carries at its outer end a contact 91 which is in line with the armature of the solenoid 85. The armature 92 is connected b 93 to a contact 94 whic is engaged by an circuit through the solenoid 86:

heretofore described.

means of a lead combination of a p urality of solenoid 86 is connected at 96 to one of the leads 82.

Normally the armature 92 is held by the solenoid out of enga 'ment with the contact 91. Upon the fai are of the lamp 17 "in immediate use the solenoid 85 is deenergized and the armature 92 falls into enga ement with the contact 91. This comp etes the circuit through the solenoid 86 which raisesthe pin 55 out of engagement with the spring holdin member 55'. The spring 51 then causes the rotation of the housin until the other pin 55 engages with the olding means 55. The other lamp is thus substituted in operative relation and the solenoid 85 is reenergized drawing up the armature 92 and breaking the The said solenoid has een previousl denergized by reason of the pin 55 str' ing against the contact 89 causing the piston 88 to rise in the dashpot 87. The contact 89 gradually returns into agement with the contact 90, but the operation is so timed that by that time the circuit has been broken through the solenoid 86 and the release of the pin 55 will not be repeated.

Various changes and modifications of the above described apparatus will readily sugt themselves to those skilled in the art, ut these are to be considered as coming within the scope of our invention, which-is set forth in the following claims.

What we claim as new and desire to secure by Letters Patent of the United States, is

1. In a picture rojection apparatus the combination of a p urality of electric lamps adapted to be placed one after the other in o erative relation with the lens system, a P ural ty of universally adjustable supports for said lamps where'b each lamp may be accurately and indivi ually adjusted with reference to said lens sytem, means for lightin a lamp not at the time in use for focally a lllSblIlg the same, and means whereby the ad usted lamp may be substituted for the lamp in use at the will of the operator.

2. In a picture projection apparatus the combination of a p urality of e ectrie lamps adapted to be placed one after the other in operative relation with the lens system, a pluralit of universally adjustable supports for said lamps whereby each lamp may be accurately and individually adjusted with reference to'said lens system, means for 1i hting a lamp not at the time in use for focafiy adjusting the same and means for automatically substituting the adjusted lamp for the lamp in use upon the fa are of the latter.

3. In a picture rejection apparatus the ectric lamps adapted to be placed one after the other in operative relation with system a plurality of adjustable supports for and lamps whereby each lamp may be aecurately and individually adjusted with reference to said lets system, means for H hting a lamp not at the time in use for finally adjusting the same, and means who the adi'usted lamp may be substitu amp'in use at the will of the operator. w 4. In a picture plrojection apparatus, the combination of a p urality of electric lam '5 adapted to be placed one after the other 111 o erative relation with the lens system; a lp uralitpl of adjustable supports for said amps w ereby each lamp ma be amurately and individually adjusted wizh reference to said lens system, means whereby each lamp may be focally adjusted prior'to' usinfi the same and means whereby an adjusted amp for the noun may. be substituted for the lamp ili use at the will of the operator.

5. A lamp fiztture for projecting apparatus 'ooinprisin 1 a relatively fixed part, a lamp suEport ovably mounted thereon, a plu-' ra ty of lamps carried by said support and so itioned thereon that either amp may be rou ht into operative position bymovement 0 said support, means for separately adgitsting said lamps relative to said support, r'e actors for each of said lamps,- and means for adjusting said reflectors independently of said lamps and or said support.

In witness whereof, we have hereunto set our hands this 17th day of January, 1916.-

" SAMUEL EVERETT DUANE.

ROBERT P. BURROWS: ARcHmsLD F. SINCLAIR. 

